DC 9V-20V to 5V 6A 4-USB Port Step-down Power Supply Converter Board Module 5-15 days with tracking. Input: 8 - 20V Output: 5V Current: 6A Max power: 30W Core components: kim-055L packaging, tps40057 chip With high frequency low resistance electrolytic capacitors, withstanding high voltage, high stability The whole welding by machine With doubling PCB board, Increasing the line width of the board to insure the current flow more smoothly One of the four USB interfaces reserving the divider resistance for your DIY